Built on digitally encrypted DECT 6.0 technology, the SupraPlus Wireless combines the clarity of traditional corded technology with the mobility of wireless - so employees can continue phone conversations up to 300 feet from their desk phone. Designed for over-the-head comfort, the SupraPlus Wireless lets wearers converse easily with coworkers without removing the headset (Monaural design) or experience total-focus sound reduction (Binaural design). Both the Voice Tube and Noise-Canceling microphone filter out excessive background sound.